Disconnect Switch

Disconnect switch uses
Implementation of disconnect switches

Purpose of disconnect switch

  • Disconnect switches establish isolation points to enable equipment maintenance. They are installed on both sides of the circuit breaker, high-side of the transformer, and on the line exit.
  • Switches cannot and should not be used to interrupt load current or fault current. A switch operation takes place after the circuit is de-energized.
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Arcing shown here occurs due to capacitive charging current, not load current.

Cost of disconnect switch

A switch can be designed in numerous ways – vertical break, center break, side break, double side break, pantograph, etc. The prices below reflect your typical vertical break configuration.

  • 365kV 3000A motor operated disconnect switch: ~$50,000
  • 138kV 2000A motor operated disconnect switch: ~$20,000

Lead time to procure disconnect switch

~22 weeks for a high voltage switch.

Information on cost and lead time is for your general knowledge only. Contact vendor with your equipment specifications for actual figures.

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